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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c2c0ac8d04a9bab8c76033e7a31dbf514305de6697180bf18013462dee545a9' 
  AND token = 'jVX3K0d4ynAvZrdrGrin+eParupPWk7HlJ/N2bEbu/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}